How can external stimuli alter post-transcriptional control of gene expression?

Which of the following is an oxidation-reduction reaction? (pictured below)

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this